<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>$Title$</title>
    <script src="${pageContext.request.contextPath}/static/js/jquery-3.6.0.js"></script>

    <script>
      function a(){
        $.post({
          url:"${pageContext.request.contextPath}/a1",
          data:{"name":$("#username").val()},
        success:function (data,status){
            console.log("data="+data);
            console.log("status="+status);
        },
          error:function (){}
                })
      }
    </script>
  </head>
  <body>
  <%--失去焦点的时候发起一个请求(携带信息)到后台--%>
  用户名：<input type="text" id="username" onblur="a()">
  </body>
</html>
